<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.js"></script>
</head>
<style>
    #pic {
        width: 100%;
        height:500px;
        border-radius: 50%;
        margin: 20px auto;
        cursor: pointer;
    }
</style>
<body>
    <img id="pic" src="">
    <input id="upload" name="file" accept="image/*" type="file" style="display: none" />
</body>
<script>
    $(function () {
        $("#pic").click(function () {
            $("#upload").click(); //隐藏了input:file样式后，点击头像就可以本地上传
            $("#upload").on("change", function () {
                var objUrl = getObjectURL(this.files[0]); //获取图片的路径，该路径不是图片在本地的路径
                if (objUrl) {
                    $("#pic").attr("src", objUrl); //将图片路径存入src中，显示出图片
                }
            });
        });
    });
    //建立一個可存取到該file的url
    function getObjectURL(file) {
        var url = null;
        if (window.createObjectURL != undefined) { // basic
            url = window.createObjectURL(file);
        } else if (window.URL != undefined) { // mozilla(firefox)
            url = window.URL.createObjectURL(file);
        } else if (window.webkitURL != undefined) { // webkit or chrome
            url = window.webkitURL.createObjectURL(file);
        }
        return url;
    }
</script>

</html>